The problem is, Wolfram Alpha is calculating the limit in the complex plane with the definition I first gave, but by what I understood the limit that was asked ignores this and uses only the fact negative numbers have odd roots (ie. we want the limit of a sequence, not the limit of the function)

Oct 10th 2009, 01:44 AM

h2osprey

Quote:

Originally Posted by mr fantastic

. So you should first consider which has the indeterminant form . Using l'Hopitals rule is an obvious thing to do.